改性纳米TiO_2的制备及其对聚丙烯的改性研究

Preparation of Modified Titanium Dioxide and Its Blending Modification for Polypropylene

用溶胶-凝胶法制备纳米二氧化钛(TiO_2),并用硅烷偶联剂γ-甲基丙烯酰氧基丙基三甲氧基硅烷(CG570)和油酸(OA)对其进行表面改性,提高了其亲油性;将改性TiO_2对聚丙烯(PP)进行共混改性制备得到PP复合材料。分别研究改性剂类型和CG570-TiO_2用量对PP复合材料力学性能、耐热性能和结晶性能的影响。研究表明,CG570-TiO_2对PP共混改性效果相对较好;当CG570-TiO_2的用量为3%时,PP复合材料的综合性能最佳;相比于纯PP,其热分解温度、结晶温度和力学性能均有所提高,其中冲击强度提高了35%。

Nano-titanium dioxide （TiO：） was prepared by sol-gel method and it was modified by γ- methaeryloxypropyhrimethoxysilane （ CG570 ） and oleic acid （ OA ） respectively. The modified TiO2 with good lipophilicity was used for blending modification of polypropylene （PP）, and the PP composites were prepared. The effects of modifier type and the amount of CG570-TiO2 on the mechanical properties, heat resistance and crystallization properties of PP composites were investigated respectively. The results shows that CG570-TiO2 has a relative good modification effect on PP blending; when the amount of CG570-TiO2 is 3% the comprehensive performance of PP composite material is decomposition temperature, crystallization temperature and the best. Compared with pure PP, the thermal mechanical properties of the PP composites are improved; particularly, the impact strength is increased by 35 %.